由于环烷烃在教材中被划分为饱和烃,使得有些学生对小环烷烃能起加成反应的事实不好理解,觉得有悖加成反应的定义。事实上,量子力学计算及分子轨道法计算都表明小环烷烃中C-C键具有一定的不饱和性。教学时,我们应该给学生讲清这一点,它们能起加成反应并不与加成反应定义相悖。 Because naphthenics are classified as saturated hydrocarbons in the textbooks, some students are not well aware of the fact that they can undergo additive reactions with small cycloalkanes, finding it contrary to the definition of an addition reaction. In fact, calculations of quantum mechanics and molecular orbital calculations show that the C-C bonds in the cycloalkane have some degree of unsaturation. When teaching, we should make it clear to our students that they can act as additive reactions that do not contradict the definition of additive reaction.